Michael kolb



(No Model.) M. KOLB.

4 GENTERING DEVICE.

No. 539,688. Patented May 21, .1895.

WITNESSES. lNVENTOfi UN I 'IfED STKTES;

PATENT OFFICE.

MICHAEL KOLB, OF NEW YORK, N. Y.

CENTERING DEVICE.

SPECIFICATION forming part of Letters Patent No. 539,688, dated May 21,1895.

Application filed March 13, 1895. Serial No. 541,681. (No model.)

To all whom it may concern:

Be it known that I, MICHAEL KOLB, of New York city, in the county andState of New York, have invented a new and Improved Centering Device, ofwhich the following is a full, clear, and exact description.

The object of the invention is to provide a new and improved centeringdevice which is comparatively simple and durable in construction, andarranged to enable the workmen to quickly and accurately punch a centerin the work. v

The invention consists principally of a longitudinal bar carrying twooppositely arranged gage arms, one of which is movable and both areadapted to peripherally engage the work at opposite sides, a transversebar carrying the centering punch, and a quadrilateral link framepivotally connected with the said gage arms and having a slidingconnection with the transverse bar.

The invention also consists of certain parts and details-andcombinations of the same, as will be fully described hereinafter andthen pointed out in the claims.

Reference is to be had to the accompanyin drawings, forming a part ofthis specification, in which similar letters of reference indicatecorresponding parts in all the figures.

Figure 1 is a plan view of the improvement as applied. Fig. 2 is asectional sideelevation of the same on the line 2 2 of Fig. l, and

Fig. 3 is an inverted plan view of the same.

The improved centering device is provided with a longitudinallyextending slotted bar A, on one end of which is secured a gage arm B,opposite which is arranged a second gage arm B, fitted to slide on thebar A. The two gage arms B and B each has rectangular arms to engage thework 0 peripherally at opposite sides, as plainly indicated in Figs. 1and 2. I

On the movable gage arm B is arranged a pivot D forming part of aquadrilateral frame D, having the links D and D connected with the saidpivot D, and connected by the pivots D and D with the links'D and Dpivoted on the pivot D held on the gage arm B and bar A. The two pivotsD and D located opposite each other, are fitted to slide in slots formedin the transverse bar E crossing the bar A at right angles on the topthereof, as is plainly shown in the drawings. In the'middie of thistransverse bar-E is secured the D will cause the transverse bar E toslide longitudinally on the bar A, to 'niove'the center punchcorrespondingly, but always in the centerof the gage arms B, B. Thuswhen the latter are moved in contact with the periphery of the work 0,as shown in Figs. 1 and 2, then the point of the center punch Findicates the center of the work, and when struck by a hammer, forms thecenter of the work 0 at one end thereof.

It will be seen that by the arrangement described, the gage arms can bereadily opened and closed, so as to easily apply the centering device onthe work, and to form the center in the end of the work by striking thecenter punch as above described.

Having thus fully described my invention, I claim as new and desire tosecure by Letters Patent 1. A centering device, comprising a longiitudinal bar, two oppositely arranged gage arms, one of which is movableon the said bar and the other is fixed thereto, 'a transverse barcarrying the center punch, and a quadrilateral frame pivotally connectedwith the said gage arms, and having a sliding connection with the saidtransverse bar, substantially as shown and described.

2. A centering device, comprising a longitudinally extending slottedbar,two oppositely arranged gage arms, one of which is secured- .to thesaid longitudinal' bar and the other is fitted to slide thereon, atransverse slotted bar held to slide on the said vertical bar,a centerpunch carried by the said transverse bar and fitted to slide in the slotof the longitudinal bar, and a quadrilateral frame composed of linkspivotally connected with each'other, the two opposite pivots being onthe said gage arms, and the other pivots fitted .to slide in the saidtransverse bar, substantially as shown and described.

. MICHAEL KOLB. Witnesses:

THEO. G. HOSTER, O. SEDcwIoK.

